We have to QUICK restart it ! Second run

She seems to be a bit more sensitive to the nutes than the other girls so with her you will have to use a little less than the rest

A little seedling like that doesn’t need much of a huge fan for it to do well. A really light breeze should suffice for the first three weeks. It’ll be able to handle more air movement once it gets out of the seedling stage. I made that mistake on my first grow and I felt like plant was staying realistic short because I had a fan blowing directly on it with no oscillation. The plant didn’t want to poke it’s head up from the edge of the pot. Good luck bro 🤙

Too much water (leaves are crooked and dropped). Roots need a little bit dried substrate before the next watering because of getting oxygen. They cant get o2 when they are permanently in wet medium. Always less is more. The same with fan. Plants dont like permanently direct air blowing. Oscillating fan is solution or direct the fan to the wall of the tent.

It looks like your giving them all way too much water, they are still seedlings and don't need the whole pot soaking to grow, and if your watering only .26gal then you shouldnt have a tray at the bottom with at least 2 inch's of water if your going for a hydro grow with only 20%runn off

Yes let the coco dry out everytime before you water again otherwise you will cause overwatering which is probably whats causing the problems she looks very over watered for a plant of this size you should only water around the base of the plant stem and not the whole medium this will drown your plant and make it grow painfully slow asa you can see lol it will pull through its just gunna take abit of time though I wouldnt worry too much about Ph atm lets just get her to a big enough stage to worry about the PH cause if you start adding pottasium to lower ph which most do that can also stunt the plant its catch 22 lol best of luck remember less is more when dealing with seedlings :) 👊

Overwatering coco isnt possible, but over concentrating fertilizers and chasing down a PH certainly could be reason for what you are seeing. The concept of "fertigation" is very flawed that you read about online, it creates a buildup of fertilizers/salts which will cause your PH to be all over the place throughout the areas of the root zone, and not to mention a waste of nutrients. @Roberts is 100% bang on for coco, like @Roberts said, maintaining that digital PH at 5.8 (or a yellow 6 to us that use chemical testers), is how I grew in coco pretty successfully too. @Roberts helped me grow a nice plant. In coco I kept the substrate irrigated the entire grow, but would alternate between nutrient feeding and just 6.0-6.5 (i use chemicals not digital PH meter) to allow for the nutrients to make it thorough my substrate and into runoff. Flowering was always PH 6.5 yellow/green on the tester, grew awesome flowers. Also, I noticed that the coco I bought had an incredibly high PH when I tested soaking water, so high my chemical tester turned purple... so higher than 8.0. It took me about 4 days of buffering my coco coir with PH 6 (yellow) water before my runoff PH was consistent. Good Luck!